They are equally precise, as we know exactly the conversion factor between inches and feet.
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20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.
189 Get 210 to be safe.
21 inch
21 feet by 21 feet is a square having an area of 441 square feet.
21 inches is the diagonal measure of the screen in a 21-inch TV.